Hide object rework - Githubissues

Hide and Display buttons didn't behave like other buttons in right click menu. This rework fixes that:

"Hide Selection" becomes "Hide" and now affect targeted object (of current selection if clicked object is part of the selection)
"Display selection" is no longer used. To display back an object, we now use only "Display hidden objects" list.

ditrit / OGrEE-3D